refactor

body.go

@@ -25,13 +25,6 @@ type BodyVelocityFunc func(body *Body, gravity vec.Vec2, damping float64, dt flo
 // BodyPositionFunc is rigid body position update function type.
 type BodyPositionFunc func(body *Body, dt float64)
 
-// Kinematic bodies are bodies that are controlled from your code instead of
-// inside the physics engine. They arent affected by gravity and they have an
-// infinite amount of mass so they don’t react to collisions or forces with other bodies.
-// Kinematic bodies are controlled by setting their velocity, which will cause them to move.
-// Good examples of kinematic bodies might include
-// things like moving platforms. Objects that are touching or jointed to a
-// kinematic body are never allowed to fall asleep.
 type Body struct {
 	// UserData is an object that this constraint is associated with.
 	//